<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<!-- 标题标记块级元素，独占一行 -->
		<h1>1111</h1>
		<h2>2222</h2>
		<h3>3333</h3>
		<h4>4444</h4>
		<h5>5555</h5>
		<h6>6666</h6>
	</body>
</html>
